CN106599972B - Ultra-high frequency RFID label chip impedance adaptive circuit and its implementation - Google Patents
Ultra-high frequency RFID label chip impedance adaptive circuit and its implementation Download PDFInfo
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- CN106599972B CN106599972B CN201510675722.1A CN201510675722A CN106599972B CN 106599972 B CN106599972 B CN 106599972B CN 201510675722 A CN201510675722 A CN 201510675722A CN 106599972 B CN106599972 B CN 106599972B
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Abstract
The invention discloses a kind of ultra-high frequency RFID label chip impedance adaptive circuit and its implementation, which includes: variable capacitance, and one end connects label antenna and rectifier, another termination charge pump circuit output；The received RF energy of antenna is changed into DC voltage by rectifier, and output end connects subsequent conditioning circuit, control circuit；Control circuit, one end connect rectifier output, and the other end connects charge pump, according to the output voltage control charge pump charge and discharge of rectifier；Charge pump carries out charge and discharge to capacitor under the control of the control circuit；Fixed capacity, one end connect variable capacitance and the charge pump, and other end ground connection stablizes V1 point voltage.The present invention can realize impedance automatic regulation function in the case where circuit power consumption expense very little.
Description
Technical field
The present invention relates to radio frequency identification (Radio Frequency Identification, RFID) technologies, especially relate to
And a kind of ultra-high frequency RFID label chip impedance adaptive circuit and its implementation.
Background technique
For a ultra-high frequency RFID label, label antenna and label chip level of impedance match be will have a direct impact on
The reading/writing distance of label, in the application we always wish label chip impedance and antenna impedance can accomplish best match so that
Label is in optimum Working, however label in actual use external environment and change, technique encapsulation is parasitic, environment
Temperature etc. all can be different degrees of the impedance matching influenced between label antenna and chip.When label because matching deteriorate and
When performance declines, it is desirable to matching and correlation be returned by the automatic adjustment of chip, thus label chip automatic impedance matching technology
It comes into being.
Traditional automatic impedance matching technology is not suitable for passive label, because they are all based on active transceiver.
For example, key component-power-sensing circuit of traditional automatic impedance matching system middle impedance mismatch detector needs electricity always
Source could work normally.At present for ultra-high frequency RFID label automatic impedance technology be mainly there are two types of: 1) be based on rectifier
Scheme: the matching degree of the impedance of antenna and chip influences the output of rectifier, and matching degree is better, the output electricity of rectifier
It presses higher.The program is made of adjustable impedance network, rectifier, comparator and logic circuit, using digitized regulative mode,
Adjustable impedance network is constantly regulate when work and compares rectifier output voltage, finally chooses impedance when maximum output voltage
Value；2) scheme of label radar cross section: scheme is can to label impedance to the reflected signal strength of label using reader
The selection of impedance network is adjusted, but it is to be determined by the radar cross section of label, and the radar of label dissipates that reader, which receives power,
Although penetrating, section is closely related with tag match, simultaneously the relationship of non-equivalence, this is to certain being stranded of actual application band
It is difficult.Therefore, it is really necessary to propose a kind of technological means, to solve the above problems.
Summary of the invention
In order to overcome the deficiencies of the above existing technologies, one of present invention is designed to provide a kind of ultra-high frequency RFID label
Chip impedance adaptive circuit and its implementation can realize that impedance is adjusted automatically in the case where circuit power consumption expense very little
Save function.
In view of the above and other objects, the present invention proposes a kind of ultra-high frequency RFID label chip impedance adaptive circuit, until
Include: less
Variable capacitance, one end connect label antenna and rectifier, another termination charge pump circuit output；
The received RF energy of antenna is changed into DC voltage by rectifier, and output end connects subsequent conditioning circuit, control electricity
Road；
Control circuit, one end connect rectifier, and the other end connects charge pump, according to the output voltage control charge of rectifier
Pump charge and discharge；
Charge pump carries out charge and discharge to capacitor under the control of the control circuit；
Capacitor, one end connect variable capacitance and the charge pump, other end ground connection.
Further, the circuit further includes a timer, and the timer controls the control circuit work for generating
The working signal of work, one terminate the output end of the rectifier, another termination control circuit.
Further, the charge pump includes a PMOS switch, the first current source, the second current source and a NMOS switch,
The grid that the charge pump PMOS switch, NMOS tube switch is connected with control circuit output, the drain electrode of the PMOS switch
Connect first current source, the second current source described in the drain series of the NMOS switch, first current source it is another
End and the other end of second current source are connected to form output node, which connects one end of the capacitor and described
Variable capacitance one end, the source electrode ground connection of the NMOS switch, the PMOS switch source electrode connect supply voltage.
In order to achieve the above objectives, the present invention also provides a kind of realization sides that ultra-high frequency RFID label chip impedance is adaptive
Method includes the following steps:
The received RF energy of antenna is changed into direct voltage output to control circuit using rectifier by step 1；
Step 2, control circuit is according to the output voltage control charge pump charge and discharge of rectifier；
Step 3, the charge and discharge according to charge pump to capacitor, the capacitor for the variable capacitance being connected in series to the capacitor accordingly change, lead
Label chip sending-end impedance variation is caused, impedance variations change the output voltage of rectifier.
Compared with prior art, a kind of ultra-high frequency RFID label chip impedance adaptive circuit of the present invention and its implementation
Using control circuit according to the output voltage control charge pump charge and discharge of rectifier, charge and discharge according to charge pump to capacitor, with
The capacitor of the concatenated variable capacitance of capacitor accordingly changes, and label chip sending-end impedance is caused to change, and impedance variations make rectifier
Output voltage VDD variation, and then have the function that reach label chip impedance automatic adjusument, the present invention can be in circuit
Impedance automatic regulation function is realized in the case where power dissipation overhead very little.
Detailed description of the invention
Fig. 1 is a kind of circuit structure of the preferred embodiment of ultra-high frequency RFID label chip impedance adaptive circuit of the present invention
Figure；
Fig. 2 is a kind of step flow chart for the implementation method that ultra-high frequency RFID label chip impedance is adaptive of the present invention.
Specific embodiment
Below by way of specific specific example and embodiments of the present invention are described with reference to the drawings, those skilled in the art can
Understand further advantage and effect of the invention easily by content disclosed in the present specification.The present invention can also pass through other differences
Specific example implemented or applied, details in this specification can also be based on different perspectives and applications, without departing substantially from
Various modifications and change are carried out under spirit of the invention.
Fig. 1 is a kind of circuit structure diagram of ultra-high frequency RFID label chip impedance adaptive circuit of the present invention.Such as Fig. 1 institute
Show, a kind of ultra-high frequency RFID label chip impedance adaptive circuit of the present invention, comprising: variable capacitance 20, charge pump 30, rectifier
40, control circuit 50, timer 60 and capacitor 70.
Wherein, the antenna 10 of label connects the anode of variable capacitance 20 and the input terminal of rectifier 40, and variable capacitance 20 is used
In adjusting impedance；The received RF energy of antenna 10 is changed into DC voltage by rectifier 40, and output end VDD is connected to subsequent
60 one end of circuit (not shown), control circuit 50 and timer；Timer 60 is used to generate the work that control control circuit 50 works
Make signal, one end connects rectifier output, and the other end connects control circuit；Control circuit 50, one end connect rectifier 40, one end
Timer 60 is connected, the other end connects charge pump 30, for 30 charge and discharge of output voltage control charge pump according to rectifier；Electricity
Lotus pump 30 is for being analog voltage signal by shift pulse signal comprising PMOS switch PMOS1, current source I1-2 and NMOS are opened
Close NMOS1, the output phase of the grid of the PMOS switch PMOS1 of charge pump 30, the grid of NMOS switch NMOS1 and control circuit 50
Even, the drain series current source I2=I of drain series the current source I1, NMOS switch NMOS1 of PMOS switch PMOS1, current source
The other end of I1=I and the other end of current source I2 are connected to form output node V1, one of output node V1 connection capacitor 70
The other end at end and variable capacitance 20, the other end of capacitor 70 and the source electrode ground connection of NMOS switch NMOS1, PMOS switch PMOS1
Source electrode connects supply voltage.
Illustrate the working principle of the invention in detail below:
When antenna 10 receives the energy of read-write equipment (reader) transmitting, rectifier 40 is started to work, and direct current is exported
Voltage VDD, 60 start-up operation open control circuit 50 of timer, impedance self-adaptive are started to work.Control is assumed when initialization
Circuit 50 is first turned on the PMOS tube of charge pump, and 30 power supply of charge pump is by PMOS switch PMOS1 with constant current I1 to capacitor
C0 (70) charging, node V1 voltage rise, which is applied to one end of variable capacitance CT, such variable capacitance CT simultaneously
(20) capacitor becomes smaller, and capacitor change causes the input impedance eyed right from antenna to change, if the change is so that rectifier
40 output voltage VDD rise, then control circuit continue open PMOS1 pipe charge to V1, node V1 is further up in turn
Change input impedance and rectifier output voltage VDD；Conversely, if the rising of V1 point voltage causes VDD to decline, control circuit
50 control NMOS switch NMOS1 conductings, capacitor C0 will be discharged by NMOS switch NMOS1, so that node V1 voltage declines, it is several
After the impedance adjustment period, the output of rectifier 40 will obtain a ceiling voltage, and impedance self-adaptive adjustment terminates, and timer closes control
Circuit 50.
Fig. 2 is a kind of step flow chart for the implementation method that ultra-high frequency RFID label chip impedance is adaptive of the present invention.Such as
Shown in Fig. 2, a kind of implementation method that ultra-high frequency RFID label chip impedance is adaptive of the present invention includes the following steps:
Step 201, the received RF energy of antenna is changed into direct voltage output to control circuit by rectifier；
Step 202, control circuit is according to the output voltage control charge pump charge and discharge of rectifier；
Step 203, the capacitor of the charge and discharge according to charge pump to capacitor, the variable capacitance being connected in series to the capacitor accordingly changes,
Label chip sending-end impedance is caused to change, impedance variations change the output voltage VDD of rectifier.
As it can be seen that a kind of ultra-high frequency RFID label chip impedance adaptive circuit of the present invention and its implementation utilize control electricity
Road is according to the output voltage control charge pump charge and discharge of rectifier, and charge and discharge according to charge pump to capacitor are connected in series to the capacitor
The capacitor of variable capacitance accordingly changes, and label chip sending-end impedance is caused to change, and impedance variations make the output voltage of rectifier
VDD variation, and then has the function that reach label chip impedance automatic adjusument, the present invention can circuit power consumption expense very
Impedance automatic regulation function is realized in the case where small.
Compared with prior art, the invention has the following beneficial effects:
1) continuously adjustable.
2) low in energy consumption, power consumption is lower than 1uW when work.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.Any
Without departing from the spirit and scope of the present invention, modifications and changes are made to the above embodiments by field technical staff.Therefore,
The scope of the present invention, should be as listed in the claims.
Claims (3)
1. a kind of ultra-high frequency RFID label chip impedance adaptive circuit, includes at least:
Variable capacitance, one end connect label antenna and rectifier, another termination charge pump circuit output；
The received RF energy of antenna is changed into DC voltage by rectifier, and output end connects subsequent conditioning circuit, control circuit；
Control circuit, one end connect rectifier, and the other end connects charge pump, filled according to the output voltage control charge pump of rectifier
Electric discharge；
Charge pump, including a PMOS switch, the first current source, the second current source and a NMOS switch, the PMOS switch, NMOS
The grid of pipe switch is connected with control circuit output, and the first current source, described described in the drain series of the PMOS switch
Second current source described in the drain series of NMOS switch, the other end of first current source and second current source it is another
End is connected to form output node, which connects one end and described variable capacitance one end of a capacitor, the NMOS switch
Source electrode ground connection, the PMOS switch source electrode connects supply voltage, and the charge pump is under the control of the control circuit to capacitor
Carry out charge and discharge；
Capacitor, one end connect variable capacitance and the charge pump, other end ground connection；
The charge pump carries out charge and discharge to capacitor under the control of the control circuit, so that the variable capacitance being connected in series to the capacitor
Capacitor accordingly change, cause label chip sending-end impedance to change, which then enables the output voltage of the rectifier
Corresponding change, to realize automatic adjusument to label chip impedance.
2. a kind of ultra-high frequency RFID label chip impedance adaptive circuit as described in claim 1, it is characterised in that: the electricity
Road further includes a timer, and the timer is used to generate the working signal for controlling the control circuit work, and one terminates institute
State the output end of rectifier, another termination control circuit.
3. a kind of implementation method that ultra-high frequency RFID label chip impedance is adaptive, includes the following steps:
The received RF energy of antenna is changed into direct voltage output to control circuit using rectifier by step 1；
Step 2, for control circuit according to the output voltage control charge pump charge and discharge of rectifier, the charge pump includes a PMOS
Switch, the first current source, the second current source and a NMOS switch, the PMOS switch, the grid of NMOS tube switch and the control
Circuit output processed is connected, the first current source described in the drain series of the PMOS switch, the drain series institute of the NMOS switch
State the second current source, the other end of the other end of first current source and second current source is connected to form output node,
The output node connects one end and variable capacitance one end of a capacitor, the source electrode ground connection of the NMOS switch, the PMOS switch
Source electrode connects supply voltage, the variable capacitance other end connection label antenna and rectifier, the capacitor other end ground connection；
Step 3, the charge and discharge according to charge pump to capacitor, the capacitor for the variable capacitance being connected in series to the capacitor accordingly change, cause to mark
Chip sending-end impedance variation is signed, impedance variations change the output voltage of rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510675722.1A CN106599972B (en) | 2015-10-16 | 2015-10-16 | Ultra-high frequency RFID label chip impedance adaptive circuit and its implementation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510675722.1A CN106599972B (en) | 2015-10-16 | 2015-10-16 | Ultra-high frequency RFID label chip impedance adaptive circuit and its implementation |
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| Publication Number | Publication Date |
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| CN106599972A CN106599972A (en) | 2017-04-26 |
| CN106599972B true CN106599972B (en) | 2019-10-25 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6844478B2 (en) * | 2017-09-14 | 2021-03-17 | オムロン株式会社 | RF tag |
| CN108427899B (en) * | 2018-05-11 | 2023-09-29 | 杭州义益钛迪信息技术有限公司 | High-precision ultrahigh-frequency RFID near-field tag detection system |
| CN110020708B (en) * | 2019-04-19 | 2022-04-05 | 中国科学院上海高等研究院 | Ultrahigh frequency RFID tag impedance self-adaptive circuit and implementation method thereof |
| CN111969973B (en) * | 2020-08-25 | 2023-09-15 | 中国科学院上海高等研究院 | Low-power consumption internet of things transceiver system with wake-up circuit |
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|---|---|---|---|---|
| CN1957538A (en) * | 2005-01-31 | 2007-05-02 | 松下电器产业株式会社 | Mobile radio apparatus capable of carrying self-adapting impedance matching |
| CN101501991A (en) * | 2006-06-27 | 2009-08-05 | 传感电子公司 | Resonant circuit tuning system with dynamic impedance matching |
| CN203894793U (en) * | 2014-06-18 | 2014-10-22 | 中国安全生产科学研究院 | RFID (Radio Frequency Identification) label |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957316A (en) * | 2011-08-31 | 2013-03-06 | 深圳艾科创新微电子有限公司 | Low-charge-injection charge pump and low charge injection method |
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2015
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|---|---|---|---|---|
| CN1957538A (en) * | 2005-01-31 | 2007-05-02 | 松下电器产业株式会社 | Mobile radio apparatus capable of carrying self-adapting impedance matching |
| CN101501991A (en) * | 2006-06-27 | 2009-08-05 | 传感电子公司 | Resonant circuit tuning system with dynamic impedance matching |
| CN203894793U (en) * | 2014-06-18 | 2014-10-22 | 中国安全生产科学研究院 | RFID (Radio Frequency Identification) label |
Non-Patent Citations (1)
| Title |
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| 无源超高频电子标签（UHF RFID）芯片天线与整流系统设计;李彦明;《中国优秀硕士学位论文全文数据库 信息科技辑》;20090715(第07期);第三章，图3-1、3-5 * |
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